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nl.c
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1996-09-28
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635 lines
/* nl -- number lines of files
Copyright (C) 89, 92, 95, 1996 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* Written by Scott Bartram (nancy!scott@uunet.uu.net)
Revised by David MacKenzie (djm@gnu.ai.mit.edu) */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include <getopt.h>
#if HAVE_LIMITS_H
# include <limits.h>
#endif
#include "system.h" /* Before regex to avoid clashes with system defines */
#if WITH_REGEX
# include <regex.h>
#else
# include <rx.h>
#endif
#ifndef UINT_MAX
# define UINT_MAX ((unsigned int) ~(unsigned int) 0)
#endif
#ifndef INT_MAX
# define INT_MAX ((int) (UINT_MAX >> 1))
#endif
#include "linebuffer.h"
#include "error.h"
#include "xstrtol.h"
#ifndef TRUE
#define TRUE 1
#define FALSE 0
#endif
/* Line-number formats. */
enum number_format
{
FORMAT_RIGHT_NOLZ, /* Right justified, no leading zeroes. */
FORMAT_RIGHT_LZ, /* Right justified, leading zeroes. */
FORMAT_LEFT /* Left justified, no leading zeroes. */
};
/* Default section delimiter characters. */
#define DEFAULT_SECTION_DELIMITERS "\\:"
/* Types of input lines: either one of the section delimiters,
or text to output. */
enum section
{
Header, Body, Footer, Text
};
char *xmalloc ();
char *xrealloc ();
/* The name this program was run with. */
char *program_name;
/* Format of body lines (-b). */
static char *body_type = "t";
/* Format of header lines (-h). */
static char *header_type = "n";
/* Format of footer lines (-f). */
static char *footer_type = "n";
/* Format currently being used (body, header, or footer). */
static char *current_type;
/* Regex for body lines to number (-bp). */
static struct re_pattern_buffer body_regex;
/* Regex for header lines to number (-hp). */
static struct re_pattern_buffer header_regex;
/* Regex for footer lines to number (-fp). */
static struct re_pattern_buffer footer_regex;
/* Pointer to current regex, if any. */
static struct re_pattern_buffer *current_regex = NULL;
/* Separator string to print after line number (-s). */
static char *separator_str = "\t";
/* Input section delimiter string (-d). */
static char *section_del = DEFAULT_SECTION_DELIMITERS;
/* Header delimiter string. */
static char *header_del = NULL;
/* Header section delimiter length. */
static int header_del_len;
/* Body delimiter string. */
static char *body_del = NULL;
/* Body section delimiter length. */
static int body_del_len;
/* Footer delimiter string. */
static char *footer_del = NULL;
/* Footer section delimiter length. */
static int footer_del_len;
/* Input buffer. */
static struct linebuffer line_buf;
/* printf format string for line number. */
static char *print_fmt;
/* printf format string for unnumbered lines. */
static char *print_no_line_fmt = NULL;
/* Starting line number on each page (-v). */
static int starting_line_number = 1;
/* Line number increment (-i). */
static int page_incr = 1;
/* If TRUE, reset line number at start of each page (-p). */
static int reset_numbers = TRUE;
/* Number of blank lines to consider to be one line for numbering (-l). */
static int blank_join = 1;
/* Width of line numbers (-w). */
static int lineno_width = 6;
/* Line number format (-n). */
static enum number_format lineno_format = FORMAT_RIGHT_NOLZ;
/* Current print line number. */
static int line_no;
/* Nonzero if we have ever read standard input. */
static int have_read_stdin;
/* If nonzero, display usage information and exit. */
static int show_help;
/* If nonzero, print the version on standard output then exit. */
static int show_version;
static struct option const longopts[] =
{
{"header-numbering", required_argument, NULL, 'h'},
{"body-numbering", required_argument, NULL, 'b'},
{"footer-numbering", required_argument, NULL, 'f'},
{"starting-line-number", required_argument, NULL, 'v'},
{"page-increment", required_argument, NULL, 'i'},
{"no-renumber", no_argument, NULL, 'p'},
{"join-blank-lines", required_argument, NULL, 'l'},
{"number-separator", required_argument, NULL, 's'},
{"number-width", required_argument, NULL, 'w'},
{"number-format", required_argument, NULL, 'n'},
{"section-delimiter", required_argument, NULL, 'd'},
{"help", no_argument, &show_help, 1},
{"version", no_argument, &show_version, 1},
{NULL, 0, NULL, 0}
};
/* Print a usage message and quit. */
static void
usage (int status)
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("\
Usage: %s [OPTION]... [FILE]...\n\
"),
program_name);
printf (_("\
Write each FILE to standard output, with line numbers added.\n\
With no FILE, or when FILE is -, read standard input.\n\
\n\
-b, --body-numbering=STYLE use STYLE for numbering body lines\n\
-d, --section-delimiter=CC use CC for separating logical pages\n\
-f, --footer-numbering=STYLE use STYLE for numbering footer lines\n\
-h, --header-numbering=STYLE use STYLE for numbering header lines\n\
-i, --page-increment=NUMBER line number increment at each line\n\
-l, --join-blank-lines=NUMBER group of NUMBER empty lines counted as one\n\
-n, --number-format=FORMAT insert line numbers according to FORMAT\n\
-p, --no-renumber do not reset line numbers at logical pages\n\
-s, --number-separator=STRING add STRING after (possible) line number\n\
-v, --first-page=NUMBER first line number on each logical page\n\
-w, --number-width=NUMBER use NUMBER columns for line numbers\n\
--help display this help and exit\n\
--version output version information and exit\n\
\n\
By default, selects -v1 -i1 -l1 -sTAB -w6 -nrn -hn -bt -fn. CC are\n\
two delimiter characters for separating logical pages, a missing\n\
second character implies :. Type \\\\ for \\. STYLE is one of:\n\
\n\
a number all lines\n\
t number only nonempty lines\n\
n number no lines\n\
pREGEXP number only lines that contain a match for REGEXP\n\
\n\
FORMAT is one of:\n\
\n\
ln left justified, no leading zeros\n\
rn right justified, no leading zeros\n\
rz right justified, leading zeros\n\
\n\
"));
}
exit (status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}
/* Build the printf format string, based on `lineno_format'. */
static void
build_print_fmt (void)
{
/* 12 = 10 chars for lineno_width, 1 for %, 1 for \0. */
print_fmt = xmalloc (strlen (separator_str) + 12);
switch (lineno_format)
{
case FORMAT_RIGHT_NOLZ:
sprintf (print_fmt, "%%%dd%s", lineno_width, separator_str);
break;
case FORMAT_RIGHT_LZ:
sprintf (print_fmt, "%%0%dd%s", lineno_width, separator_str);
break;
case FORMAT_LEFT:
sprintf (print_fmt, "%%-%dd%s", lineno_width, separator_str);
break;
}
}
/* Set the command line flag TYPEP and possibly the regex pointer REGEXP,
according to `optarg'. */
static int
build_type_arg (char **typep, struct re_pattern_buffer *regexp)
{
const char *errmsg;
int rval = TRUE;
int optlen;
switch (*optarg)
{
case 'a':
case 't':
case 'n':
*typep = optarg;
break;
case 'p':
*typep = optarg++;
optlen = strlen (optarg);
regexp->allocated = optlen * 2;
regexp->buffer = (unsigned char *) xmalloc (regexp->allocated);
regexp->translate = NULL;
regexp->fastmap = xmalloc (256);
regexp->fastmap_accurate = 0;
errmsg = re_compile_pattern (optarg, optlen, regexp);
if (errmsg)
error (EXIT_FAILURE, 0, "%s", errmsg);
break;
default:
rval = FALSE;
break;
}
return rval;
}
/* Print and increment the line number. */
static void
print_lineno (void)
{
printf (print_fmt, line_no);
line_no += page_incr;
}
/* Switch to a header section. */
static void
proc_header (void)
{
current_type = header_type;
current_regex = &header_regex;
if (reset_numbers)
line_no = starting_line_number;
putchar ('\n');
}
/* Switch to a body section. */
static void
proc_body (void)
{
current_type = body_type;
current_regex = &body_regex;
putchar ('\n');
}
/* Switch to a footer section. */
static void
proc_footer (void)
{
current_type = footer_type;
current_regex = &footer_regex;
putchar ('\n');
}
/* Process a regular text line in `line_buf'. */
static void
proc_text (void)
{
static int blank_lines = 0; /* Consecutive blank lines so far. */
switch (*current_type)
{
case 'a':
if (blank_join > 1)
{
if (line_buf.length || ++blank_lines == blank_join)
{
print_lineno ();
blank_lines = 0;
}
else
printf (print_no_line_fmt);
}
else
print_lineno ();
break;
case 't':
if (line_buf.length)
print_lineno ();
else
printf (print_no_line_fmt);
break;
case 'n':
printf (print_no_line_fmt);
break;
case 'p':
if (re_search (current_regex, line_buf.buffer, line_buf.length,
0, line_buf.length, (struct re_registers *) 0) < 0)
printf (print_no_line_fmt);
else
print_lineno ();
break;
}
fwrite (line_buf.buffer, sizeof (char), line_buf.length, stdout);
putchar ('\n');
}
/* Return the type of line in `line_buf'. */
static enum section
check_section (void)
{
if (line_buf.length < 2 || memcmp (line_buf.buffer, section_del, 2))
return Text;
if (line_buf.length == header_del_len
&& !memcmp (line_buf.buffer, header_del, header_del_len))
return Header;
if (line_buf.length == body_del_len
&& !memcmp (line_buf.buffer, body_del, body_del_len))
return Body;
if (line_buf.length == footer_del_len
&& !memcmp (line_buf.buffer, footer_del, footer_del_len))
return Footer;
return Text;
}
/* Read and process the file pointed to by FP. */
static void
process_file (FILE *fp)
{
while (readline (&line_buf, fp))
{
switch ((int) check_section ())
{
case Header:
proc_header ();
break;
case Body:
proc_body ();
break;
case Footer:
proc_footer ();
break;
case Text:
proc_text ();
break;
}
}
}
/* Process file FILE to standard output.
Return 0 if successful, 1 if not. */
static int
nl_file (const char *file)
{
FILE *stream;
if (!strcmp (file, "-"))
{
have_read_stdin = 1;
stream = stdin;
}
else
{
stream = fopen (file, "r");
if (stream == NULL)
{
error (0, errno, "%s", file);
return 1;
}
}
process_file (stream);
if (ferror (stream))
{
error (0, errno, "%s", file);
return 1;
}
if (!strcmp (file, "-"))
clearerr (stream); /* Also clear EOF. */
else if (fclose (stream) == EOF)
{
error (0, errno, "%s", file);
return 1;
}
return 0;
}
int
main (int argc, char **argv)
{
int c, exit_status = 0;
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
have_read_stdin = 0;
while ((c = getopt_long (argc, argv, "h:b:f:v:i:pl:s:w:n:d:", longopts,
(int *) 0)) != EOF)
{
switch (c)
{
case 0:
break;
case 'h':
if (build_type_arg (&header_type, &header_regex) != TRUE)
usage (2);
break;
case 'b':
if (build_type_arg (&body_type, &body_regex) != TRUE)
usage (2);
break;
case 'f':
if (build_type_arg (&footer_type, &footer_regex) != TRUE)
usage (2);
break;
case 'v':
{
long int tmp_long;
if (xstrtol (optarg, NULL, 10, &tmp_long, NULL) != LONGINT_OK
/* Allow it to be negative. */
|| tmp_long > INT_MAX)
error (EXIT_FAILURE, 0, _("invalid starting line number: `%s'"),
optarg);
starting_line_number = (int) tmp_long;
}
break;
case 'i':
{
long int tmp_long;
if (xstrtol (optarg, NULL, 10, &tmp_long, NULL) != LONGINT_OK
|| tmp_long <= 0 || tmp_long > INT_MAX)
error (EXIT_FAILURE, 0, _("invalid line number increment: `%s'"),
optarg);
page_incr = (int) tmp_long;
}
break;
case 'p':
reset_numbers = FALSE;
break;
case 'l':
{
long int tmp_long;
if (xstrtol (optarg, NULL, 10, &tmp_long, NULL) != LONGINT_OK
|| tmp_long <= 0 || tmp_long > INT_MAX)
error (EXIT_FAILURE, 0, _("invalid number of blank lines: `%s'"),
optarg);
blank_join = (int) tmp_long;
}
break;
case 's':
separator_str = optarg;
break;
case 'w':
{
long int tmp_long;
if (xstrtol (optarg, NULL, 10, &tmp_long, NULL) != LONGINT_OK
|| tmp_long <= 0 || tmp_long > INT_MAX)
error (EXIT_FAILURE, 0,
_("invalid line number field width: `%s'"),
optarg);
lineno_width = (int) tmp_long;
}
break;
case 'n':
switch (*optarg)
{
case 'l':
if (optarg[1] == 'n')
lineno_format = FORMAT_LEFT;
else
usage (2);
break;
case 'r':
switch (optarg[1])
{
case 'n':
lineno_format = FORMAT_RIGHT_NOLZ;
break;
case 'z':
lineno_format = FORMAT_RIGHT_LZ;
break;
default:
usage (2);
break;
}
break;
default:
usage (2);
break;
}
break;
case 'd':
section_del = optarg;
break;
default:
usage (2);
break;
}
}
if (show_version)
{
printf ("nl - %s\n", PACKAGE_VERSION);
exit (EXIT_SUCCESS);
}
if (show_help)
usage (0);
/* Initialize the section delimiters. */
c = strlen (section_del);
header_del_len = c * 3;
header_del = xmalloc (header_del_len + 1);
strcat (strcat (strcpy (header_del, section_del), section_del), section_del);
body_del_len = c * 2;
body_del = xmalloc (body_del_len + 1);
strcat (strcpy (body_del, section_del), section_del);
footer_del_len = c;
footer_del = xmalloc (footer_del_len + 1);
strcpy (footer_del, section_del);
/* Initialize the input buffer. */
initbuffer (&line_buf);
/* Initialize the printf format for unnumbered lines. */
c = strlen (separator_str);
print_no_line_fmt = xmalloc (lineno_width + c + 1);
memset (print_no_line_fmt, ' ', lineno_width + c);
print_no_line_fmt[lineno_width + c] = '\0';
line_no = starting_line_number;
current_type = body_type;
current_regex = &body_regex;
build_print_fmt ();
/* Main processing. */
if (optind == argc)
exit_status |= nl_file ("-");
else
for (; optind < argc; optind++)
exit_status |= nl_file (argv[optind]);
if (have_read_stdin && fclose (stdin) == EOF)
{
error (0, errno, "-");
exit_status = 1;
}
if (ferror (stdout) || fclose (stdout) == EOF)
error (EXIT_FAILURE, errno, _("write error"));
exit (exit_status == 0 ? EXIT_SUCCESS : EXIT_FAILURE);
}